How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
LIGHT AND SOUND
They are objects that produce light
They are objects that reflect some of the light that hits them
It is an area where there is little or no light
Speed of light
They let the light pass through them
They do not let the light pass through them
They let same of the light pass through them